There is a bug in the Blackboard 5 time analysis. There are apparently no hits from 0 to 9 hours in the histogram of accesses by time of day (or in the summary table of these data):
The table of accesses by time of day per student does, however, show hits before 10 a.m. The bug is probably due to the coding of time; the summary table and histogram use single digits for hours before 10 a.m. (that is 0, 1, 2 ... 9) while the raw data of accesses per student use double digits (00, 01, 02 ... 09).